Silicon-oxygen composite negative electrode material, preparation method thereof and lithium ion battery
A negative electrode material, silicon-oxygen technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex coating process, no breakthrough in performance improvement, and high coating cost.
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[0077] Second aspect, such as figure 1 As shown, the application provides a method for preparing a silicon-oxygen composite negative electrode material, comprising the following steps:
[0078] S100, mixing the precursor with the pre-lithiated carbon-coated silicon-oxygen material, and performing a solid-state thermal reaction under a protective atmosphere to obtain a silicon-oxygen composite negative electrode material; the precursor includes a mixture of a phosphate ion-containing compound and a metal compound , metal phosphate, at least one of a mixture of a silicate ion compound and a metal compound, and a metal silicate; the silicon-oxygen composite negative electrode material includes a silicon-oxygen material and a composite coating layer formed on the surface of the silicon-oxygen material, The composite coating layer includes a carbon material and a lithium-containing compound, the carbon material has pores, and the lithium-containing compound is filled in the pores. ...
Embodiment 1
[0128] (1) react carbon-coated silicon-oxygen material SiO / C with metal lithium to obtain pre-lithiated carbon-coated silicon-oxygen material Li-SiO / C, wherein the lithium content is 10 wt%;
[0129] (2) Put V 2 o 5 Mix with phosphoric acid in a molar ratio of 1:3 to obtain a precursor;
[0130] (3) After high-speed dispersion of 5g precursor and 100g Li-SiO / C, under the protection of Ar gas, roast at 900°C for 6 hours, control the heating rate at 2°C / min, disperse and sieve after natural cooling to obtain silicon Oxygen composite anode material.
[0131] The average particle size (D 50 ) is 5.13μm, and the tap density is 0.98g / cm 3 , the specific surface area is 2.19m 2 / g, the porosity is 1.98%, and the carbon content is 5.0wt%. The composite coating layer of the silicon-oxygen composite negative electrode material is 100nm, and the lithium-containing compound is mainly Li 3 V 2 (PO 4 ) 3 , the lithium-containing compound is dispersed and filled in the pores of the...
Embodiment 2
[0133] (1) react carbon-coated silicon-oxygen material SiO / C with metal lithium to obtain pre-lithiated carbon-coated silicon-oxygen material Li-SiO / C, wherein the lithium content is 10 wt%;
[0134] (2) MgO and SiO 2 Mix according to the molar ratio of 1:1 to obtain the precursor;
[0135] (3) After high-speed dispersion of 5g precursor and 100g Li-SiO / C, under the protection of Ar gas, bake at 700°C for 6 hours, control the heating rate at 2°C / min, disperse and sieve after natural cooling to obtain silicon Oxygen composite anode material.
[0136] The average particle diameter (D 50 ) is 5.12μm, and the tap density is 0.98g / cm 3 , the specific surface area is 2.17m 2 / g, the porosity is 1.99%, and the carbon content is 5.0wt%. The composite coating layer of the silicon-oxygen composite negative electrode material is 100nm, wherein the lithium-containing compound includes Li 2 MgSiO 4 , the lithium-containing compound is dispersed and filled in the pores of the carbon ...
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